Mecmesin 172100 Manuale utente

Contents

Powering the Gauge 2

Using the Gauge 3

Optional Settings 8

Dimensions 10

BFG Specification Table 11

Introduction

Thank you for choosing the Mecmesin Basic Force

Gauge (BFG) instrument. With correct use and regular

re-calibration it will give many years of accurate and

reliable service.

The Mecmesin BFG is a member of a series of

highly versatile display units. By using the latest

integrated circuit technology it has been

possible to produce an instrument which can

be used to measure tensile and compressive

forces accurately, whilst being simple to

use by the operator.

Before Use

Upon receiving the unit please check

that no physical damage has occurred

to the packaging material, plastic case or

the instrument itself. If any damage is

evident please notify Mecmesin immediately.

Operation

The most commonly used features such as displaying force,

peak hold, zero and changing of displayed units can all be

done by pressing a single dedicated key on the front panel.

For less frequently used features a number of "hot keys" are

provided, whereby the operator simply presses and holds 2

keys to enable a gauge option.

Page 1

Powering the

Gauge

Fitting the rechargeable

batteries

Charging the

rechargeable batteries

Low battery symbol

Mains operation

Fitting of alkaline batteries

Battery safety information

The BFG is supplied with a set of 4 rechargeable Nickel Metal

Hydride AAA batteries. For safety reasons during transportation

the batteries are not fitted and are not fully charged.

To insert the batteries you must first remove the battery cover on

the rear of the gauge by removing the 2 retaining screws. Fit

the 4 batteries in the battery holder ensuring that you observe

polarity.

Refit the battery cover and tighten the 2 retaining screws.

Connect the mains adaptor/charger into the charger socket on

the top-right hand-side of the gauge, charge the batteries for

14-16 hours. Only use the adaptor/charger supplied. A fully

charged battery pack will provide in excess of 50 hours

constant use between charges.

If the low battery symbol appears on the display the accuracy

of the loadcell reading may be compromised and the gauge

will power down after a short period of time.

The BFG can also be powered directly from the mains. This

can be achieved with or without the batteries being fitted.

Connect the mains adaptor to your mains supply. Only use the

adaptor supplied.

The BFG can also be powered by AAA 1.5V alkaline batteries

(not supplied). For fitting of alkaline batteries, follow fitting

instructions as per rechargeable batteries above.

Warning: When alkaline batteries are fitted, the mains

adaptor/charger must NEVER be connected to the BFG due to

risk of acid leakage which could damage the instrument.

NEVER:

Short circuit Disassemble or deform cells

Heat or incinerate Immerse in water

Solder anything to the battery terminals

Reverse individual cell polarity

Use alternative chargers other than those supplied by Mecmesin

Use replacement parts other than those supplied by Mecmesin

Never dispose of batteries with ‘normal’ refuse. Contact your

local Environmental Authority to determine the location of your

appropriate disposal facility.

Page 2

Using the Gauge

Fitting accessories

Mounting to a test stand

Powering up

Affix the short extension rod (30mm long) to the loadcell

probe in the hole at the bottom of the gauge by tightening it

gently with the fingers.

Your chosen grip or accessory may now be connected to the

extension rod.

Note: When fitting a grip ensure that it is screwed finger-tight

only. Excessive torque or overtightening can damage the

loadcell.

Never fit any accessory without first sitting an extension rod.

On the rear of the gauge there are two M5 threaded holes,

which can be used for mounting the gauge to a Mecmesin

test stand.

Each Mecmesin test stand is supplied with a dedicated

‘dovetailed mounting bracket’ and screws for this purpose.

If you wish to mount the gauge to another type of stand,

ensure that the screws used are threaded into the gauge to a

maximum depth of 10mm. If screws are fitted beyond this

depth, damage to the loadcell will occur.

As shown in Figure 1 the control panel has 5 Function keys

plus an On/Off key:-

To power up the gauge press

the red key. A short self

test runs during which the

display will show the model

and capacity in newtons.

fig.1

Page 3

After the self test, providing no load has been applied to the

instrument, the display will show all zero's. This is because

the gauge re-zero's itself during the self test routine.

If a force is applied perpendicularly via the extension rod to

the loadcell, the reading on the display will register the

applied force.

Should the instrument have sustained a catastrophic overload,

the symbol ‘OL’ will be permanently displayed and the

instrument must be returned to Mecmesin or an approved

Mecmesin distributor for repair.

Forces greater than 120% of full-scale will produce an OL

symbol which will remain on the display all the time the

overload is present.

To power down the gauge press the red key.

Tensile forces are displayed on the BFG and recognised by

the symbol . See Fig. 2.

Compressive forces are displayed on the BFG and

recognised by the symbol . See Fig 3b.

Fig. 2

Symbol for

tension

Unit of

measurement





Please note that a BFG

measuring very low forces may

not show zero if it is moved

during the self test routine. Once

it is properly mounted and

zeroed the reading will be stable

Display of Tension/

Compression

Page 4

During the operation of the gauge it is often necessary to

zero the display – e.g. when you wish to tare out the weight

of a grip, so it does not become part of the measured

reading. Press and release the ZERO key. The display will

blink momentarily as the zero operation is carried out.

You can choose from the following units of measurement

depending on the capacity of your gauge: millinewtons,

kilonewtons, newtons, gram-force, kilogram-force, ounce-force

or pound-force.

To change the display units press and release the UNITS key.

Each successive key press will select the next available units

until the gauge returns to its original setting. The BFG

automatically converts readings as new units of measure are

selected.

The gauge detects and stores maximum (peak) force in both

compressive and tensile directions.

Press the MAX key and the display will show the maximum

tensile force identified by the symbol.

Zeroing the Gauge

Changing the unit of

measurement

Max (Peak) Readings

Max Tension

Page 5



Fig. 3a

Symbol for

tension

Press the MAX key again and the display will show the

maximum compressive force identified by the symbol.

Press the MAX key again and the display will show the

current load applied to the loadcell in either direction,

maintaining a “running” display.

Press the RESET key to clear both maximum registers and

prepare for detecting the next maximum readings.

Fig. 3b

Symbol for

compression



Max Compression

"Normal" mode

Fig. 3c

Page 6

The BFG has RS232, Mitutoyo and analogue output signals.

It is possible to transmit the displayed reading to peripheral

devices (e.g. PC, printer) by pressing and releasing the TXD

key.

Displayed readings can also be requested individually from a

PC via the RS232 interface by sending a "?" (ascii D63 [3fh])

character.

For sending a continuous data stream to a PC, press and

hold the TXD key for 2 seconds then release. A ‘1’ will now

appear in the display to indicate that data can now be sent.

To stop sending data, simply press and release the TXD key,

at which point a ‘1’ will disappear from the display.

Please note that the continuous data stream only starts when

approximately 2% of the rated capacity of the gauge is

reached.

Hold down the Ctrl key on the keyboard and pressing the

following keys or sending their equivalent ASCII code as

shown in brackets:

to simulate pressing the TXD key *(ascii DØ1 [Ø1h])

to simulate pressing the UNITS key (ascii DØ2 [Ø2h])

to simulate pressing the MAX key (ascii DØ3 [Ø3h])

to simulate pressing the RESET key (ascii DØ4 [Ø4h])

to simulate pressing the ZERO key (ascii DØ5 [Ø5h])

*Note that the continuous transmission mode cannot be

entered via this method

The BFG is delivered from the factory with the following

settings as default:

Display = “Normal” mode

Auto-off = Not active

Transmit minus sign = Not active

Data Output

BFG uses 9600 Baud 8 data

bits, 1 start bit 1 stop bit and no

parity

When the continuous data

stream option is selected the

gauge defaults to a BAUD rate

of 57,600.

A full range of data cables are

available to connect your gauge

to peripheral devices – see page

12.

Remote key press from PC

Factory Defaults

Page 7

To conserve battery power, it is possible to activate an Auto-

off function so that the gauge powers down after 5 minutes

since the last key press or remote request or load change

greater than 2% of full scale.

Holding down the ON/OFF key while the gauge ‘boots up’

will either enable or disable the auto-off function (i.e. toggle

from its current state). If the auto-off function is enabled then

‘Ao’ is displayed. If the auto-off function is disabled then ‘No

Ao’ is displayed. This setting is stored in the memory and is

remembered when the gauge is powered down.

If you suspect that your loadcell transducer has sustained an

overload it is possible to check the status of the loadcell

immediately.

Symptoms of overload may be (a) OL in display (b) probe

not aligned perpendicularly to gauge (c) display will not

return to zero (d) F.S.D cannot be achieved (e) instrument

readings are not repeatable.

Place the gauge horizontally on a flat level surface without

any accessories attached.

Hold down the MAX key whilst turning the gauge on. The

value displayed is the percentage difference (Loadcell offset)

between the load currently present on the gauge and the

gauges first ever calibration relative to full scale counts.

Optional Settings

through Dual

Function keys

Auto-off

Loadcell Diagnostic test

An instrument showing an

overload condition cannot be

relied upon to provide accurate,

repeatable measurement –consult

your supplier.

Page 8

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